A pressure gage, similar to device "D" shown in the illustration, is installed on the vessel's ventilation system. The gage is indicating 30 inches of water (7.465 kPa), but the accuracy of the gage is in doubt. Using a piece of clear hose, you construct a simple U tube mercury manometer, similar to device "C" illustrated. Once installed, the distance between the levels is 12.7 centimeters. How inaccurate is the existing draft gage? See illustration GS-0154.
A pressure gage, similar to device "D" shown in the illustration, is installed on the vessel's ventilation system. The gage is indicating 30 inches of water (7.465 kPa), but the accuracy of the gage is in doubt. Using a piece of clear hose, you construct a simple U tube mercury manometer, similar to device "C" illustrated. Once installed, the distance between the levels is 12.7 centimeters. How inaccurate is the existing draft gage? See illustration GS-0154.
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